Opening Bid: Two Notrump - 10+ HCP
5-5 in the Majors
The agreement described here is not commmon to most forcing club systems, but it does fit well with the style. We no longer need an opening bid of 2NT to describe a balanced hand with 20-21 points, so we can use the bid for a hand that is sometimes difficult to bid. Consider using an opening bid of 2NT for hands that have at least 5-5 in the majors.
How often do you hold a hand with two 5-card majors? The mathematicians of the game say that we hold such hands approximately 5.5% of all hands. That's actually pretty often.
Most of the hands that fit this agreement should be in the 11-16 point range, but you can open with as little as 10 points, and sometimes even 9 points, but only if you have better distribution, such as 6-5 or 6-6 in the majors. Also, you are not limited to 16 or fewer points with this particular call. Be careful with light openings, especially if you are vulnerable, because you are committed to play at the 3-level or higher.
If you have a minimum point-count, it's a good idea to have all of your points in your two suits!
This is an excellent example of the bid:
Responder Bids a Major at Either the 3-Level or the 4-Level
Most of the time these two responses should be passed because your partner assumes you have the normal point-count range. However, you can open 2NT with far more than that, and if partner tries to stop at the 3-level, you can push it to game. If you have a strong hand, and partner wants to play game, you can explore for a slam.
Responder Bids Either 3 or 3